tipout.c revision 28365 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)tipout.c	8.1 (Berkeley) 6/6/93";
37#endif
38static const char rcsid[] =
39	"$Id$";
40#endif /* not lint */
41
42#include "tip.h"
43/*
44 * tip
45 *
46 * lower fork of tip -- handles passive side
47 *  reading from the remote host
48 */
49
50static	jmp_buf sigbuf;
51
52/*
53 * TIPOUT wait state routine --
54 *   sent by TIPIN when it wants to posses the remote host
55 */
56void
57intIOT()
58{
59
60	write(repdes[1],&ccc,1);
61	read(fildes[0], &ccc,1);
62	longjmp(sigbuf, 1);
63}
64
65/*
66 * Scripting command interpreter --
67 *  accepts script file name over the pipe and acts accordingly
68 */
69void
70intEMT()
71{
72	char c, line[256];
73	register char *pline = line;
74	char reply;
75
76	read(fildes[0], &c, 1);
77	while (c != '\n') {
78		*pline++ = c;
79		read(fildes[0], &c, 1);
80	}
81	*pline = '\0';
82	if (boolean(value(SCRIPT)) && fscript != NULL)
83		fclose(fscript);
84	if (pline == line) {
85		boolean(value(SCRIPT)) = FALSE;
86		reply = 'y';
87	} else {
88		if ((fscript = fopen(line, "a")) == NULL)
89			reply = 'n';
90		else {
91			reply = 'y';
92			boolean(value(SCRIPT)) = TRUE;
93		}
94	}
95	write(repdes[1], &reply, 1);
96	longjmp(sigbuf, 1);
97}
98
99void
100intTERM()
101{
102
103	if (boolean(value(SCRIPT)) && fscript != NULL)
104		fclose(fscript);
105	exit(0);
106}
107
108void
109intSYS()
110{
111
112	boolean(value(BEAUTIFY)) = !boolean(value(BEAUTIFY));
113	longjmp(sigbuf, 1);
114}
115
116/*
117 * ****TIPOUT   TIPOUT****
118 */
119void
120tipout()
121{
122	char buf[BUFSIZ];
123	register char *cp;
124	register int cnt;
125	extern int errno;
126	int omask;
127
128	signal(SIGINT, SIG_IGN);
129	signal(SIGQUIT, SIG_IGN);
130	signal(SIGEMT, intEMT);		/* attention from TIPIN */
131	signal(SIGTERM, intTERM);	/* time to go signal */
132	signal(SIGIOT, intIOT);		/* scripting going on signal */
133	signal(SIGHUP, intTERM);	/* for dial-ups */
134	signal(SIGSYS, intSYS);		/* beautify toggle */
135	(void) setjmp(sigbuf);
136	for (omask = 0;; sigsetmask(omask)) {
137		cnt = read(FD, buf, BUFSIZ);
138		if (cnt <= 0) {
139			/* lost carrier */
140			if (cnt < 0 && errno == EIO) {
141				sigblock(sigmask(SIGTERM));
142				intTERM();
143				/*NOTREACHED*/
144			} else if (cnt == 0 && errno == ENOENT) {
145				if (getppid() != 1)
146					kill(getppid(),SIGUSR1);
147				sigblock(sigmask(SIGTERM));
148				intTERM();
149				/*NOTREACHED*/
150			} else if (cnt < 0) {
151				if (getppid() != 1)
152					kill(getppid(),SIGUSR1);
153				sigblock(sigmask(SIGTERM));
154				intTERM();
155				/*NOTREACHED*/
156			}
157			continue;
158		}
159#define	ALLSIGS	sigmask(SIGEMT)|sigmask(SIGTERM)|sigmask(SIGIOT)|sigmask(SIGSYS)
160		omask = sigblock(ALLSIGS);
161		for (cp = buf; cp < buf + cnt; cp++)
162			*cp &= 0177;
163		write(1, buf, cnt);
164		if (boolean(value(SCRIPT)) && fscript != NULL) {
165			if (!boolean(value(BEAUTIFY))) {
166				fwrite(buf, 1, cnt, fscript);
167				continue;
168			}
169			for (cp = buf; cp < buf + cnt; cp++)
170				if ((*cp >= ' ' && *cp <= '~') ||
171				    any(*cp, value(EXCEPTIONS)))
172					putc(*cp, fscript);
173		}
174	}
175}
176